package com.guomao;

import java.util.Arrays;
import java.util.Scanner;

public class SystemDemo {

    public static void main(String[] args) {
        System.out.println();
        Scanner scanner = new Scanner(System.in);


        int[] arr1 = {1, 2, 3, 4, 5, 6, 7, 8, 9};

        int[] arr2 = {1, 2, 3, 4, 5, 6, 7, 8, 9};

        System.arraycopy(arr1, 3, arr2, 0, 5);

        System.out.println(Arrays.toString(arr2));

        //1747400184463
        System.out.println(System.currentTimeMillis());

        System.out.println(System.getProperty("java.version"));
        System.out.println(System.getProperty("os.name"));

        System.out.println(System.getenv("PATH"));
        System.gc();
        System.exit(0);
    }
}
